Supporting material for the paper 

"Sensitivity of Polarization to Grain Shape: II. Aggregates"
                B. T. Draine
        (Astrophysical Journal, in press)

The file suppmat_v1.pdf contains:

* Images of all 45 aggregates, each from 3 viewing angles.

* Angle-averaged extinction efficiencies Q_{ext,ran} vs lambda for all
  45 aggregates, for selected sizes (a_{eff} = 0.05, 0.10, 0.20,
  0.30um), and wavelengths from 0.1um to 100um (quantity plotted is
  lambda*Q_{ext,ran}/a_{eff}).

* Polarization efficiency for perfect spinning alignment, Q_{pol,PSA}
  vs lambda for all 45 aggregates, for selected sizes (a_{eff} = 0.05,
  0.10, 0.20, 0.30um), and wavelengths from 0.1um to 100um (quantity
  plotted is lambda*Q_{pol,PSA}/a_{eff}).

Directory DDSCAT contains supporting information and results from the
calculations using the discrete dipole approximation code DDSCAT
(Draine & Flatau 1994):

   Directory DDSCAT has a file for the dielectric function for the
   solid material:

   astrodust_DH21c_P0.20_0.00_1.400 = dielectric function from Draine
   & Hensley (2021a,b) for "Astrodust" with microporosity P=0.20,
   fraction of Fe in metallic form = 0.00, with grains assumed to be
   oblate spheroids with axial ratio b/a=1.400

   DDSCAT has subdirectories for each of the 45 target geometries:

     bisphere
     threesphere
     trisphere
     ba.256.1
     ba.256.2
     ba.256.3
     ba.256.4
     bam1.256.1
     bam1.256.2
     bam1.256.3
     bam1.256.4
     bam1trimA.256.1
     bam1trimA.256.2
     bam1trimA.256.3
     bam1trimA.256.4
     bam1trimB.256.1
     bam1trimB.256.2
     bam1trimB.256.3
     bam1trimB.256.4
     bam1trimC.256.1
     bam1trimC.256.2
     bam2.256.1
     bam2.256.2
     bam2.256.3
     bam2.256.4
     bam2trimA.256.1
     bam2trimA.256.2
     bam2trimA.256.3
     bam2trimA.256.4
     bam2trimB.256.1
     bam2trimB.256.2
     bam2trimB.256.3
     bam2trimB.256.4
     bam2trimC.256.1
     bam2trimC.256.2
     batrimA.256.1
     batrimA.256.2
     batrimA.256.3
     batrimA.256.4
     batrimB.256.1
     batrimB.256.2
     batrimB.256.3
     batrimB.256.4
     batrimC.256.1
     batrimC.256.2

   Each subdirectory contains:

    * one example ddscat.par file for each of the 3 different target
      resolutions employed in the paper (i.e., three different values
      of N = number of dipoles).  The sample ddscat.par files each
      specify a single size, a_{eff}=0.20um and 151 wavelengths from
      0.1um to 100um.  ddscat.par files for other values of a_{eff}
      are easily obtained by simply editing line 31, replacing "0.20"
      (twice) with the desired value of a_{eff} (in um).  See the
      documentation for DDSCAT at www.ddscat.org for further
      information on use of DDSCAT (Draine & Flatau 1994).

    * extrap_target_aeff files, where
        target = name of that target geometry (e.g., batrimC.256.1)
         aeff = value of a_{eff} (in um)

      The "extrap" files take DDSCAT results calculated with three
      different number N of dipoles, and extrapolates to N=infinity
      using Eq. (8) of Draine (2024a) to estimate the "true" values of
      various quantities.  For each size, the "extrap" files includes
 
        lambda_p = effective wavelength for starlight polarization
        Phi      = polarization efficiency integral,
        sigma_p  = parameter for width of the polarization profile
        p_FIRmax = maximum linear polarization in the FIR
 
        and other quantities

        For all quantities we give uncertainties estimated using
        Eq. (9) of Draine (2024a).


      Also given are Qran, Qpol(PSA), Qsca, Qext(PSA) with
      uncertainties.

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References:

Draine, B.T. 2024a, "Sensitivity of Polarization to Grain Shape:
   I. Convex Shapes", ApJ, 961, 103

Draine, B.T., & Flatau, P.J. 1994, "Discrete dipole approximation for
   scattering calculations", J. Opt. Soc. Am. A, 11, 1491.

Draine, B.T., & Hensley, B.S. 2021a, "The Dielectric Function of
   'Astrodust' and Predictions for Polarization in the 3.4um and 10um
   Features", ApJ, 909, 94

Draine, B.T., & Hensley, B.S. 2021b, "Using the Starlight Polarization
   Integral to Constrain Shapes and Porosities of Interstellar Grains", 
   ApJ, 919, 65.
